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CHAPTER 2 DISSECTING NANT
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<task name="property" /> <target name="go" go: > <task name="echo"> <message level="Info"> <![CDATA[Hello World!]]> </message> [echo] Hello World! </task> </target> </buildresults> BUILD SUCCEEDED Total time: 0.1 seconds. Output completed (2 sec consumed) - Normal Termination The effect has been to merge both logs into the output window. That certainly is not much use, so of course the effective way to use the logger and listener is to ensure that a log file is defined. The following line is probably the best arrangement: nant -logger:NAnt.Core.XmlLogger -listener:NAnt.Core.DefaultLogger -logfile:mylog.xml In the standard output window, the following is shown: ---------- NAnt ---------NAnt 0.85 Copyright (C) 2001-2003 Gerry Shaw http://nant.sourceforge.net Buildfile: file:/// HelloWorld.build Target(s) specified: go go: [echo] Hello World! BUILD SUCCEEDED Total time: 0.1 seconds. Output completed (2 sec consumed) - Normal Termination The mylog.xml file contains the following:
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<buildresults project="HelloWorld"> <message level="Info"><![CDATA[Buildfile: file:///D:/BookCode/2/HelloWorld.build]]></message> <message level="Info"><![CDATA[Target(s) specified: go]]></message> <task name="property" /> <target name="go"> <task name="echo"> <message level="Info"><![CDATA[Hello World!]]></message> </task> </target> </buildresults> The log file itself has nothing other than XML so it can be transformed or otherwise manipulated directly.
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Note NAnt uses the powerful log4net library for logging and, as is typical of NAnt in general, it is easy to
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extend. For our purposes, console and XML logging will be satisfactory, but you may have a specific need to implement more esoteric solutions.
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This is a very nice switch. When you are confronted with a complex build file (such as the NAnt build file itself), it can be helpful to figure out the available targets that can be run from the build file. Running this against our file produces the following output: ---------- NAnt ---------NAnt 0.85 Copyright (C) 2001-2003 Gerry Shaw http://nant.sourceforge.net Default Target: target3 Main Targets: target1 target2 target3 Sub Targets: Output completed (0 sec consumed) - Normal Termination This is target1 This is target2 This is target3 This is target3
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This demonstrates that there are three available targets and that target3 will be called by default if no target is specified. This is very useful when you are first inspecting a complicated or lengthy build file. In this instance, no subtargets are displayed. It is not obvious from the NAnt documentation what the difference between a main target and a subtarget is. As it turns out, we can use Reflector to investigate Nant.Core.DLL, as shown in Figure 2-4.
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Figure 2-4. Reflecting over ProjectHelp.xslt It turns out that a target is classified as a main target if it has a description, and is classified as a subtarget if it does not have a description. This can be seen at about the halfway point of the XSLT file in Figure 2-4. Simple.
Caution It can be dangerous to allow the whole script to run if no target is specified. This execution
could easily be in error. It should be considered best practice to create an information only target as the default. This ensures that actions are always explicitly invoked and provides the author with the option of some improved informational messages.
CHAPTER 2 DISSECTING NANT
<target>
This is not a switch in the usual way. NAnt accepts a list of targets as parameters on the command line. These parameters override the default target and represent the actual target(s) to be run. The usual dependencies within the build file apply, though. So, for example, in our test script it is not possible to execute target2 without executing target1, but it is possible to execute target2 without executing target3. There is no syntax for the switch. The target names are listed by using the names of the targets: nant target2 You can place multiple target calls on the command line. NAnt will execute each target and its dependencies in turn. An example of this is nant target1 target2 target3 Using this option at the command line can mean that all dependencies can be removed from the NAnt file itself potentially, but this increases the command-line call, which might not be so intuitive for any user.
If you want to prevent execution of individual targets within a script, then you can prefix the target Tip
name with a dash ( ). This has the effect of making the NAnt invocation command (nant target2) look as though the target is an argument name, and hence causes an error.
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